Measurement and Instrumentation
A meter has a full-scale deflection of 90o at a current of 1 A. The response of the meter is square law. Assuming spring control, the current for a deflection at 45o will be

 0.25 A.
 0.70 A.
 0.50 A.
 0.67 A.

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Measurement and Instrumentation
The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?

  Period and frequency measurement modes respectively.
 Period measurment modes only.
 Frequency and period measurment modes, respectively.
 Frequency measurment modes only.

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Measurement and Instrumentation
In measurement system, the function of the signal manipulating elements is to

 to perform linear operation like addition and multiplication.
 change the magnitude of the input signal while retaining its identity.
 to perform non liner operation like clipping filtering, chopping and clamping.
 change the quantity under measurement to an analogues signal.

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